SPINDLE SHELLS. 21 



mark of this species. These shells may be found on 

 rocks, between tides, and may be easily recognized by 

 the figure and the description. 



Macron Kellettii, A. Ad., Kel-let'-ti-i, is a larger 

 species, found on the coast of Lower California. The 

 shell is of a dark color, nearly smooth, or marked with 

 low ridges. The aperture is very large, the outer lip 

 thin, and the canal a mere notch. Its length is more 

 than an inch. 



Trophon multicostatus, Ksch., Tro'-fon mul-ti-cos- 

 ta'-tus, is a northern species, having a small, pear- 

 shaped, white shell, with several sharp, frill-like 

 varices. The sutures are deep, and the few whorls 

 of the spire are very distinct. Otherwise it is smooth. 

 Length, less than an inch. 



Trophon Orpheus, Gld., Or-fe'-us, is smaller than 

 the last, but similar in shape. The sharp, white 

 varices make a crown at the sutures. These varices 

 are crossed by small spiral lines. 



Fusus Kobelti, Dall, Fu'-sus Ko-bel'-ti, is found on 

 Santa Catalina Island. It is spindle-shaped, and very 

 graceful in form. There are five or six whorls, with 

 nine elevations on each whorl, crossed by fine, dark, 

 spiral lines. Color, whitish ; length, from an inch 

 to two inches. 



Fusus ambustus, Gld., am-bus'-tus, has a small, 

 spindle-shaped shell, with a rather long aperture. 

 The dark-colored surface is roughened by numerous 

 knobs and spiral lines. Length, less than an inch. 



A beautiful shell found occasionally at San Diego, 

 and further to the south, is known as Murex trialatus, 

 Sowb., Mu'-rex tri-a-la'-tus. It is a representative of 

 the great genus of rock-shells, which are so abundant 



